Electrical protecting system



Feb. 8, 1944. V g, w BMRD 2,341,135

ELECTRICAL PROTECTING SYSTEM Filed April as, 1942 lllllHlllllH //vvE/-/7"oe: I CLYDE W. BAIED) ,01% m mm, 7

motor.

Patented Feb. 8, 1944 ELECTRICAL PROTECTING SYSTEM Clyde w. Baird, Columbus, Ohio, Traylor Vibrator Company, a

Colorado assignor to The corporation of Application April 25, 1942, Serial No. 440,508

10 Claims.

This invention relates to an electrical system for protecting a vibratory motor by openin the circuit of the vibratory motor whenever the amplitude of vibration becomes undesirably high.

An object of the'invention therefore is to provide means to carry out the functions above set forth.

Other objects of the invention will appeal hereinafter, the novel features and combination beme set forth in the appended claims.

In the accompanying drawing,

Fig. 1 is a wiring diagram of the system of my invention including as a part thereof a switch which is shown in some detail; and

Fig. 2 is a side elevational view of one form of vibratory motor constituting a part of the system of my invention.

Referring to said drawing, there is illustrated in Fig. 2 a vibratory feeder, for example, of the construction of the vibratory feeder shown more completely in the patent to Earle V. Francis, No. 2,161,342, dated June 6, 1939, which vibratory feeder includes as a part thereof a vibratory It is desirable to prevent continuous vibration of such a vibratory motor at a high amplitude of vibration for this may cause self-destruction of the motor either by pounding the pole faces or by breaking the vibrating bars. In the system of my invention the motor circuit is open whenever a predetermined maximum amplitude of vibration is reached.

In the drawing, the feeder It includes a motor I l and a deck l2, the structure as aforesaid being disclosed more completely in the above identified patent to Earle V. Francis. Mounted on the main frame of the motor H is a switch 13 which may have any desired construction necessary to carry out the functions hereinafter described. One form of such a switch is illustrated in detail as comprising a base M to be attached to the main frame of the motor H to which base is rigidly attached a housing l5 preferably cylindrical in shape and formed of conducting metal. Within the housing l5is a cylindrical plunger l8 having oppositely extending extensions I1 and [8. Extension l8 terminates in a threaded portion upon which is threaded a bumper I9 held in adjusted position by a lock nut 20. The bumper I9 is so positioned with respect to the deck [2 of the feeder as to be contacted thereby when said deck has a predetermined amplitude of vibration. The plunger I6 is of conducting material. Also Within the housing !5 is a disc 2| of insulating material which is held against forward movement by stops 22 on the interior of housing l5 and against the rear face of which is positioned a tube of insulating material 23. A plug 24 of conducting material closes the left hand end of housing l5 and said tube 23. The left hand end of housing I5 is preferably spun over to lock the parts in position. Within the tube 23 is a plunger 25 with forward and rear extensions 26 and 21 respectively, the former extending through a central opening in the disc 2|. Coil springs 28 and 29 cooperate with the plungers l6 and 25 respectively, urging them to their extreme right hand positions. The housing I5 preferably forms one terminal of the switch which may be grounded, the other terminal being formed by the plug 24 which is in electrical contact with the plunger 25 by virtue of the coil sprin 29. Plunger I6 is in contact with the housing l5 through the extension 18 which is in contact with the cylindrical surface provided by the hole in the head of housing l5 through which said extension I8 extends.

Whenever the amplitude of vibration of the deck l2 becomes sufficient to contact bumper l9 and force the plug it rearwardly until extension [1 thereof contacts extension 2b of plunger 25, the switch l3 will be in its closed circuit position, it normally being in open position.

It is to be understood that any other desirable construction of switch l3 may be employed, which is normally open and which is closed by a predetermined amplitude of vibration of the motor I I, or any part thereof.

Referring particularly to the electrical circuit of Fig. l, alternating current is supplied from any desirable source, such as the usual commercial source, by way of conductors 3t and 3| which lead to the primary of a transformer 32. Branching from conductor St is a conductor 33 which extends through normally closed stop switch 34 and thence to one terminal of the winding of a relay 35 provided with normally closed contacts 36 and normally open contacts 37. From the coil of relay 35 the circuit extends to the late of a tube 38 which is preferably a cold cathode electron discharge tube. The cathode of said tube 38 is connected by way of conductor 39 to the conductor 3!. The above described circuit from conductors 38 and 3! through switch (it, coil of relay 35 and tube 38, provides a normally open circuit by virtue of the tube 38 so that under normal conditions relay 35 will be in the position illustrated in Fig. 1 of the drawing. It may be pointed out at this time that whenever the relay 35 is energized it breaks the contacts 36 and closes the contacts 31. Contacts 31 are holding contacts and provide a shunt circuit for the tube the startswitch 46 38 which is obvious, thus holding the relay in its energized position once it is energized, until it is released by opening switch 34.

It may be pointed out here that contacts 36 when broken, open the power circuit to the motor I l of feeder H]. For example, as seen in Fig. 1 of the drawing said motor H is energized from a source of undulating or alternating current by way of conductors 40 and 4| which are controlled by a magnetic switch 42 having an operating coil 43 which controls power contacts 44 and control contact 45 to supply power to the motor II from the conductors 40 and 4|. A normally open start switch 46 when closed energizes the coil 43 over a circuit extending from conductor 44 through start switch 46, normally closed contacts 36 of relay 35, normally closed stop switch 41, coil 43 of switch 42, one terminal of which is connected to conductor 46. When coil or solenoid 43 is thus energized, power contacts 44 close the power circuit to motor I! and control contacts 45 shunt which is, of course, immediately released after being closed to start the apparatus. This provides a holding circuit for the magnetic switch 42 which includes the contacts 36 of relay 35 and the stop switch 41 in series.

Obviously, if contact 36 is open or stop switch 41 is open, the magnetic switch 42 is reset, opening the circuit to motor It. To provide for the instantaneous opening of said power circuit to the motor H through the operation of the relay 35 and under the control of the switch I3, the tube 38 is provided with an exciter circuit which when energized even for an instant will render the normally non-conducting tube 38 conducting, to effect the result above mentioned. To this end transformer 32 is provided with a low voltage secondary which energizes the primary winding of a transformer 48 whenever switch I3 is closed by way of conductor 33, primary of transformer 48, switch l3 and conductor 49. Transformer 48 is preferably a step-up transformer which provides a relatively high voltage on the secondary, such as 100 volts, which voltag is applied to the cathode and grid or discharge controlling electrode of said tube 38.

In the operation of the device, to start the mechanism in operation the switch 46 is temporarily closed and the magnetic switch will operate to close the power contacts 44 and the control contact 45, the switch remaining closed until stopped by opening the switch 41 or contacts 36. Should the amplitude of vibration of the vibratory motor H reach a pre-selected maximum, which may be adjusted to any desired Value as for example by adjusting the position of the bumper l9, so as to close the contacts of switch 13, an exciting voltage will appear on the tube 38 to render it conducting where it had previously been non-conducting. When said tube 38 is rendered conducting, or in other words fired, current will flow from the conductors 3t and 3| through said tube 38, solenoid of relay 35 and the switch breaking the contacts 38 and locking the relay 35 in contact breaking position independently of the tube 38. This, of course, will shut down the system by opening the circuit to coil 43 of magnetic switch 42. Relay 35 will be re-set by opening the switch 34 temporarily, whereupon the parts will be restored to the positions illustrated in the drawing and will be ready to be started again. It is thus evident that I have provided a shut down. It is to be noted that control switch I3 is operated directly and mechanically by the vibration of motor II. This eliminates all costly electrical pick-up apparatus, making for simplicity and cheapness.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spir' and scope of the invention as defined by the claims heretofore appended, and I wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I now desire to secure by Letters Patent of the United States is:

1. An electrical system including a non-rotary vibratory electro-magnetic motor, a power circuit for said motor, and switch means responsive directly and mechanically to a predetermined amplitude of vibration of said motor for opening the circuit of said motor.

2. An electrical control system including a vibratory electro-magnetic motor, a circuit for energizing said motor, relay means for opening said circuit, control means including an electronic tube for operating said relay means, and switch means operated mechanically by vibratory movement of said motor when a predetermined amplitude of vibration is reached to operate said control means thereby to open said motor circuit.

3. An electrical control system comprising a vibratory electro-magnetic motor, a switch operated mechanically thereby whenever said m0- tor has a predetermined amplitude of vibration, and mechanism controlled by said switch when it is operated, said mechanism including an electron-discharge tube which is normally nonconducting and is rendered conducting when said predetermined amplitude of vibration is reached.

4. An electrical control system comprising a non-rotary vibratory electro-magnetic motor, a switch operated mechanically thereby whenever said motor has a predetermined amplitude of vibration, and mechanism controlled by said switch when it is operated.

5. An electrical control circuit including a viincluding a source of current and an electronic plitude of vibration of said vibratory motor to render said tube conducting thereby to energize said relay, said means including a switch mounted on and operated mechanically by said motor.

'7. A control circuit comprising a vibratory elective-magnetic motor, means for reducing its amplitude of vibration whenever it reaches a predetermined high value including a relay, an energizing circuit for said relay including a normally de-energized cold cathode electron discharge tube, and means operable when the am plitude of vibration of said motor reaches said predetermined high value to make said tube conducting and thereby energize said relay, said second-named means including a switch mounted on and controlled mechanically by said motor and an exciting circuit for said tube controlled by said switch.

8. A control circuit comprising a vibratory electro-magnetic motor, means for reducing its amplitude of vibration whenever it reaches a predetermined high value including a relay, an energizing circuit for said relay including a normally de-energized electron discharge tube, and means operable when the amplitude of vibration of said motor reaches said predetermined high value to make said tube conducting and thereby energize said relay, said second-named means including a switch mounted on and controlled mechanically by said motor and an exciting circuit for said tube controlled by said switch.

9. An electrical system including a non-rotary vibratory electro-magnetic motor, a power circuit for said motor, and means responsive to a predetermined amplitude of vibration of said motor for opening circuit of said motor.

1%. An electrical system including a non-rotary vibratory electro-magnetic motor, a power circuit for said motor, and switch means responsive to a predetermined amplitude of vibration of said motor for controlling the circuit of said motor.

CLYDE W. BAIRD. 

